[6] | 1 | !********************************************************************** |
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| 2 | ! Copyright 1998,1999,2000,2001,2002,2005,2007,2008,2009,2010 * |
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| 3 | ! Andreas Stohl, Petra Seibert, A. Frank, Gerhard Wotawa, * |
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| 4 | ! Caroline Forster, Sabine Eckhardt, John Burkhart, Harald Sodemann * |
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| 5 | ! * |
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| 6 | ! This file is part of FLEXPART. * |
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| 7 | ! * |
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| 8 | ! FLEXPART is free software: you can redistribute it and/or modify * |
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| 9 | ! it under the terms of the GNU General Public License as published by* |
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| 10 | ! the Free Software Foundation, either version 3 of the License, or * |
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| 11 | ! (at your option) any later version. * |
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| 12 | ! * |
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| 13 | ! FLEXPART is distributed in the hope that it will be useful, * |
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| 14 | ! but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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| 15 | ! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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| 16 | ! GNU General Public License for more details. * |
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| 17 | ! * |
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| 18 | ! You should have received a copy of the GNU General Public License * |
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| 19 | ! along with FLEXPART. If not, see <http://www.gnu.org/licenses/>. * |
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| 20 | !********************************************************************** |
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| 21 | |
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| 22 | real function ew(x) |
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| 23 | |
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| 24 | !**************************************************************** |
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| 25 | !SAETTIGUNGSDAMPFDRUCK UEBER WASSER IN PA. X IN KELVIN. |
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| 26 | !NACH DER GOFF-GRATCH-FORMEL. |
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| 27 | !**************************************************************** |
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| 28 | |
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| 29 | implicit none |
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| 30 | |
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| 31 | real :: x, y, a, c, d |
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| 32 | |
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| 33 | ew=0. |
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| 34 | if(x.le.0.) stop 'sorry: t not in [k]' |
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| 35 | y=373.16/x |
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| 36 | a=-7.90298*(y-1.) |
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| 37 | a=a+(5.02808*0.43429*alog(y)) |
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| 38 | c=(1.-(1./y))*11.344 |
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| 39 | c=-1.+(10.**c) |
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| 40 | c=-1.3816*c/(10.**7) |
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| 41 | d=(1.-y)*3.49149 |
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| 42 | d=-1.+(10.**d) |
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| 43 | d=8.1328*d/(10.**3) |
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| 44 | y=a+c+d |
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| 45 | ew=101324.6*(10.**y) ! Saettigungsdampfdruck in Pa |
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| 46 | |
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| 47 | end function ew |
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